Change size of JButtons

Question

I have a very big problem. I need to do vertical menu in the center of window. What could be easier? What I did:

1. I create JFrame and set BorderLayout to it: JFrame jfr = new JFrame("Frame");
2. Then I create 4 buttons:

JButton b1 = new JButton("b1");
JButton b2 = new JButton("b2");
JButton b3 = new JButton("b3");
JButton b4 = new JButton("b4");

3. I created panel and add all buttons to panel:

JPanel jpan = new JPanel();
jpan.setLayout(new BoxLayout(jpan, BoxLayout.Y_AXIS));
jpan.add(b1);
jpan.add(b2);
jpan.add(b3);
jpan.add(b4);

4. Aligned all buttons

b1.setAlignmentX(JComponent.CENTER_ALIGNMENT);
b2.setAlignmentX(JComponent.CENTER_ALIGNMENT);
b3.setAlignmentX(JComponent.CENTER_ALIGNMENT);
b4.setAlignmentX(JComponent.CENTER_ALIGNMENT);

5. And add panel to JFrame

jfr.add(jpan, BorderLayout.CENTER);

Please help me to understand this layouts: Only say like this, "You should use this: when you use this layout" And now main question: How can I change size of buttons?

Answer 1

There are a number of easy ways to change the size of buttons:

1. Give the buttons an icon of a different size.
2. Make the font of the buttons a different size.
3. Set more / less space between the button contents (the icon and text) and the border of the button.
4. Give the buttons more / less text.

Given the last is quite arbitrary, here is a demonstration of the first 3 techniques: